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How hard is it to replace the battery on an iPhone 3GS? The phone is pretty old, but I don't want to spend the money to replace my 3GS and get locked into a new 2 year contract. The battery has gotten to the point where I really have to keep a charger nearby if I want to make it through the day.

Aside from taking the steps to decrease power consumption that were mentioned in the first response to your question, the least intrusive way of adding battery life that I've found is a Mophie Juice Pack Plus case.  As the name suggest, it's a case, but it also includes a 2000 mAh battery.

To be perfectly honest, about the only time I still use it is when I am out having a few pints with friends to try to get funny responses.  For sure the "wow" factor has worn off.  After getting past the initial novelty of being able to have an ersatz conversation with your mobile, it is a sometimes useful, but not vital feature.